Question

What is the substance that forms hydronium ions in water (Arrhenius)?

Answer 1

Substances which form hydronium ions (`H_3O^+`) in water are known as Arrhenius Acids.

Explanation:

According to Arrhenius' concept of acids, an acid is such a compound which when dissolved in water, releases proton(s) or `H^+`.

Now as an Arrhenius acid releases `H^+`, the proton combines with a `H_2O` molecule to produce a `H_3O^+` ion which is an hydronium ion.

Examples of Arrhenius Acids -

`HCl, H_2SO_4, HNO_3, HBr, HI, HClO_4`